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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "content/browser/device_sensors/data_fetcher_shared_memory.h" | |
6 | |
7 #include "base/logging.h" | |
8 #include "base/metrics/histogram.h" | |
9 #include "content/browser/device_sensors/ambient_light_mac.h" | |
10 #include "third_party/sudden_motion_sensor/sudden_motion_sensor_mac.h" | |
11 | |
12 namespace { | |
13 | |
14 const double kMeanGravity = 9.80665; | |
15 | |
16 double LMUvalueToLux(uint64_t raw_value) { | |
17 // Conversion formula from regression. | |
18 // https://bugzilla.mozilla.org/show_bug.cgi?id=793728 | |
19 // Let x = raw_value, then | |
20 // lux = -2.978303814*(10^-27)*x^4 + 2.635687683*(10^-19)*x^3 - | |
21 // 3.459747434*(10^-12)*x^2 + 3.905829689*(10^-5)*x - 0.1932594532 | |
22 | |
23 static const long double k4 = pow(10.L, -7); | |
24 static const long double k3 = pow(10.L, -4); | |
25 static const long double k2 = pow(10.L, -2); | |
26 static const long double k1 = pow(10.L, 5); | |
27 long double scaled_value = raw_value / k1; | |
28 | |
29 long double lux_value = | |
30 (-3 * k4 * pow(scaled_value, 4)) + (2.6 * k3 * pow(scaled_value, 3)) + | |
31 (-3.4 * k2 * pow(scaled_value, 2)) + (3.9 * scaled_value) - 0.19; | |
32 | |
33 double lux = ceil(static_cast<double>(lux_value)); | |
34 return lux > 0 ? lux : 0; | |
35 } | |
36 | |
37 void FetchLight(content::AmbientLightSensor* sensor, | |
38 content::DeviceLightHardwareBuffer* buffer) { | |
39 DCHECK(sensor); | |
40 DCHECK(buffer); | |
41 // Macbook pro has 2 lux values, left and right, we take the average. | |
42 // The raw sensor values are converted to lux using LMUvalueToLux(raw_value) | |
43 // similar to how it is done in Firefox. | |
44 uint64_t lux_value[2]; | |
45 if (!sensor->ReadSensorValue(lux_value)) | |
46 return; | |
47 uint64_t mean = (lux_value[0] + lux_value[1]) / 2; | |
48 double lux = LMUvalueToLux(mean); | |
49 buffer->seqlock.WriteBegin(); | |
50 buffer->data.value = lux; | |
51 buffer->seqlock.WriteEnd(); | |
52 } | |
53 | |
54 void FetchMotion(SuddenMotionSensor* sensor, | |
55 content::DeviceMotionHardwareBuffer* buffer) { | |
56 DCHECK(sensor); | |
57 DCHECK(buffer); | |
58 | |
59 float axis_value[3]; | |
60 if (!sensor->ReadSensorValues(axis_value)) | |
61 return; | |
62 | |
63 buffer->seqlock.WriteBegin(); | |
64 buffer->data.accelerationIncludingGravityX = axis_value[0] * kMeanGravity; | |
65 buffer->data.hasAccelerationIncludingGravityX = true; | |
66 buffer->data.accelerationIncludingGravityY = axis_value[1] * kMeanGravity; | |
67 buffer->data.hasAccelerationIncludingGravityY = true; | |
68 buffer->data.accelerationIncludingGravityZ = axis_value[2] * kMeanGravity; | |
69 buffer->data.hasAccelerationIncludingGravityZ = true; | |
70 buffer->data.allAvailableSensorsAreActive = true; | |
71 buffer->seqlock.WriteEnd(); | |
72 } | |
73 | |
74 void FetchOrientation(SuddenMotionSensor* sensor, | |
75 content::DeviceOrientationHardwareBuffer* buffer) { | |
76 DCHECK(sensor); | |
77 DCHECK(buffer); | |
78 | |
79 // Retrieve per-axis calibrated values. | |
80 float axis_value[3]; | |
81 if (!sensor->ReadSensorValues(axis_value)) | |
82 return; | |
83 | |
84 // Transform the accelerometer values to W3C draft angles. | |
85 // | |
86 // Accelerometer values are just dot products of the sensor axes | |
87 // by the gravity vector 'g' with the result for the z axis inverted. | |
88 // | |
89 // To understand this transformation calculate the 3rd row of the z-x-y | |
90 // Euler angles rotation matrix (because of the 'g' vector, only 3rd row | |
91 // affects to the result). Note that z-x-y matrix means R = Ry * Rx * Rz. | |
92 // Then, assume alpha = 0 and you get this: | |
93 // | |
94 // x_acc = sin(gamma) | |
95 // y_acc = - cos(gamma) * sin(beta) | |
96 // z_acc = cos(beta) * cos(gamma) | |
97 // | |
98 // After that the rest is just a bit of trigonometry. | |
99 // | |
100 // Also note that alpha can't be provided but it's assumed to be always zero. | |
101 // This is necessary in order to provide enough information to solve | |
102 // the equations. | |
103 // | |
104 const double kRad2deg = 180.0 / M_PI; | |
105 double beta = kRad2deg * atan2(-axis_value[1], axis_value[2]); | |
106 double gamma = kRad2deg * asin(axis_value[0]); | |
107 | |
108 // Make sure that the interval boundaries comply with the specification. At | |
109 // this point, beta is [-180, 180] and gamma is [-90, 90], but the spec has | |
110 // the upper bound open on both. | |
111 if (beta == 180.0) | |
112 beta = -180; // -180 == 180 (upside-down) | |
113 if (gamma == 90.0) | |
114 gamma = nextafter(90, 0); | |
115 | |
116 // At this point, DCHECKing is paranoia. Never hurts. | |
117 DCHECK_GE(beta, -180.0); | |
118 DCHECK_LT(beta, 180.0); | |
119 DCHECK_GE(gamma, -90.0); | |
120 DCHECK_LT(gamma, 90.0); | |
121 | |
122 buffer->seqlock.WriteBegin(); | |
123 buffer->data.beta = beta; | |
124 buffer->data.hasBeta = true; | |
125 buffer->data.gamma = gamma; | |
126 buffer->data.hasGamma = true; | |
127 buffer->data.allAvailableSensorsAreActive = true; | |
128 buffer->seqlock.WriteEnd(); | |
129 } | |
130 | |
131 } // namespace | |
132 | |
133 namespace content { | |
134 | |
135 DataFetcherSharedMemory::DataFetcherSharedMemory() { | |
136 } | |
137 | |
138 DataFetcherSharedMemory::~DataFetcherSharedMemory() { | |
139 } | |
140 | |
141 void DataFetcherSharedMemory::Fetch(unsigned consumer_bitmask) { | |
142 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
143 DCHECK(consumer_bitmask & CONSUMER_TYPE_ORIENTATION || | |
144 consumer_bitmask & CONSUMER_TYPE_MOTION || | |
145 consumer_bitmask & CONSUMER_TYPE_LIGHT); | |
146 | |
147 if (consumer_bitmask & CONSUMER_TYPE_ORIENTATION) | |
148 FetchOrientation(sudden_motion_sensor_.get(), orientation_buffer_); | |
149 if (consumer_bitmask & CONSUMER_TYPE_MOTION) | |
150 FetchMotion(sudden_motion_sensor_.get(), motion_buffer_); | |
151 if (consumer_bitmask & CONSUMER_TYPE_LIGHT) | |
152 FetchLight(ambient_light_sensor_.get(), light_buffer_); | |
153 } | |
154 | |
155 DataFetcherSharedMemory::FetcherType DataFetcherSharedMemory::GetType() const { | |
156 return FETCHER_TYPE_POLLING_CALLBACK; | |
157 } | |
158 | |
159 bool DataFetcherSharedMemory::Start(ConsumerType consumer_type, void* buffer) { | |
160 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
161 DCHECK(buffer); | |
162 | |
163 switch (consumer_type) { | |
164 case CONSUMER_TYPE_MOTION: { | |
165 if (!sudden_motion_sensor_) | |
166 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
167 bool sudden_motion_sensor_available = | |
168 sudden_motion_sensor_.get() != nullptr; | |
169 | |
170 motion_buffer_ = static_cast<DeviceMotionHardwareBuffer*>(buffer); | |
171 UMA_HISTOGRAM_BOOLEAN("InertialSensor.MotionMacAvailable", | |
172 sudden_motion_sensor_available); | |
173 if (!sudden_motion_sensor_available) { | |
174 // No motion sensor available, fire an all-null event. | |
175 motion_buffer_->seqlock.WriteBegin(); | |
176 motion_buffer_->data.allAvailableSensorsAreActive = true; | |
177 motion_buffer_->seqlock.WriteEnd(); | |
178 } | |
179 return sudden_motion_sensor_available; | |
180 } | |
181 case CONSUMER_TYPE_ORIENTATION: { | |
182 if (!sudden_motion_sensor_) | |
183 sudden_motion_sensor_.reset(SuddenMotionSensor::Create()); | |
184 bool sudden_motion_sensor_available = | |
185 sudden_motion_sensor_.get() != nullptr; | |
186 | |
187 orientation_buffer_ = | |
188 static_cast<DeviceOrientationHardwareBuffer*>(buffer); | |
189 UMA_HISTOGRAM_BOOLEAN("InertialSensor.OrientationMacAvailable", | |
190 sudden_motion_sensor_available); | |
191 if (sudden_motion_sensor_available) { | |
192 // On Mac we cannot provide absolute orientation. | |
193 orientation_buffer_->seqlock.WriteBegin(); | |
194 orientation_buffer_->data.absolute = false; | |
195 orientation_buffer_->data.hasAbsolute = true; | |
196 orientation_buffer_->seqlock.WriteEnd(); | |
197 } else { | |
198 // No motion sensor available, fire an all-null event. | |
199 orientation_buffer_->seqlock.WriteBegin(); | |
200 orientation_buffer_->data.allAvailableSensorsAreActive = true; | |
201 orientation_buffer_->seqlock.WriteEnd(); | |
202 } | |
203 return sudden_motion_sensor_available; | |
204 } | |
205 case CONSUMER_TYPE_LIGHT: { | |
206 if (!ambient_light_sensor_) | |
207 ambient_light_sensor_ = AmbientLightSensor::Create(); | |
208 bool ambient_light_sensor_available = | |
209 ambient_light_sensor_.get() != nullptr; | |
210 | |
211 light_buffer_ = static_cast<DeviceLightHardwareBuffer*>(buffer); | |
212 if (!ambient_light_sensor_available) { | |
213 light_buffer_->seqlock.WriteBegin(); | |
214 light_buffer_->data.value = std::numeric_limits<double>::infinity(); | |
215 light_buffer_->seqlock.WriteEnd(); | |
216 } | |
217 return ambient_light_sensor_available; | |
218 } | |
219 default: | |
220 NOTREACHED(); | |
221 } | |
222 return false; | |
223 } | |
224 | |
225 bool DataFetcherSharedMemory::Stop(ConsumerType consumer_type) { | |
226 DCHECK(base::MessageLoop::current() == GetPollingMessageLoop()); | |
227 | |
228 switch (consumer_type) { | |
229 case CONSUMER_TYPE_MOTION: | |
230 if (motion_buffer_) { | |
231 motion_buffer_->seqlock.WriteBegin(); | |
232 motion_buffer_->data.allAvailableSensorsAreActive = false; | |
233 motion_buffer_->seqlock.WriteEnd(); | |
234 motion_buffer_ = nullptr; | |
235 } | |
236 return true; | |
237 case CONSUMER_TYPE_ORIENTATION: | |
238 if (orientation_buffer_) { | |
239 orientation_buffer_->seqlock.WriteBegin(); | |
240 orientation_buffer_->data.allAvailableSensorsAreActive = false; | |
241 orientation_buffer_->seqlock.WriteEnd(); | |
242 orientation_buffer_ = nullptr; | |
243 } | |
244 return true; | |
245 case CONSUMER_TYPE_LIGHT: | |
246 if (light_buffer_) { | |
247 light_buffer_->seqlock.WriteBegin(); | |
248 light_buffer_->data.value = -1; | |
249 light_buffer_->seqlock.WriteEnd(); | |
250 light_buffer_ = nullptr; | |
251 } | |
252 return true; | |
253 default: | |
254 NOTREACHED(); | |
255 } | |
256 return false; | |
257 } | |
258 | |
259 } // namespace content | |
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